Making monsters for OSR games

Let’s go back to basics for a minute. How do you make your monsters? I remember in 3.5e there were deep and detailer rules, almost impossible to understand and follow, to make new monsters, a procedure that would take hours.

I hate that crap!

But OSR is different, here you can make a monster in under a minute, or five minutes if you really think about it. This is what I do.